Owner closing business and walking away

You state that the company is incorporated.  Why then would any of the owners be responsible for any of its outstanding bills?  Have any of you signed personal guarantees?  As long as you operated the corporation properly, for example not commingling corporate money with personal, not paying personal expenses from coprorate funds, etc., the shareholders are not generally liable for the corporation's debts.  If, however, the debtrs you write about are among the few statutory exceptions to this rule, or that the corporation was not operated properly allowing personal liability of itss hareholders, you can't, at this point, protect yourself from the obligation (absent filing bankruptcy), you can only sue the third shareholder for his share of the obligation.